DEPENDENCE OF THE ADHESIVE STRENGTH OF AN EPOXY COATING ON A STEEL SURFACE ON THE AMOUNTS OF A URETHANE MODIFIER
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Protective polymer coatings are analyzed. The results of studying the dependence of the adhesive strength of epoxy resin on the amounts of urethane and silicon diurethane modifiers are highlighted. Increasing the ratio of hydroxylurethane:epoxy resin to 15:85, compared with the original size, an increase in adhesive strength by 20%, which is associated with an increase in the proportion of urethane bonds. However, a further increase in the amount of modifying additive (30%) is characterized by the presence of signs, due to the lack of epoxy groups for the formation of a network structure during curing. The epoxy number of this hybrid oligomer is 6.84%, the epoxy equivalent value is 617.3 g/mol. Increasing the curing temperature from 120 to 150ºС significant process duration up to 30 versus 90 minutes. The strength of samples based on silicon diurethane in all temperature ranges and duration of curing practically has the corresponding values with the first samples.
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